Equilibrium — practice questions

269 curated practice questions from Equilibrium (Chemistry JEE Main, NTA Exams) — 51 medium, 205 easy, 13 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

• Which of the following is strongest Bronsted base? (Jee Main 2024)
• When two reactants, A and B are mixed to give products, C and D, the reaction quotient, (Q) at the initial stages of…
• The equilibrium constant (K p ) for the decomposition of gaseous H 2 O H 2 O (g) ⇌ H 2 (g) + 1 2 O 2 (g) is related to…
• Which of the following mixture will have the pH close to 1 ?
• A (g) ⇋ B _ ( ) + C 2 ( ) . The correct relationship between K P , α and equilibrium pressure P is (Jee Main 2024)
• For the given hypothetical reactions, the equilibrium constants are as follows: X ⇌ Y; K 1 = 1.0 Y ⇌ Z; K 2 = 2.0 Z ⇌…
• How many moles of HCOONa must be added to 1L of 0.1 M HCOOH to prepare a buffer solution with a pH of 3.4 ? (Given : K…
• Two gaseous equilibria SO _ 2 ( ~g )+ 1 2 O _ 2 ( ~g ) SO _ 3 ( ~g ) and 2SO 3 (g) ⇌ 2SO 2 (g) + O 2 (g) have…
• The equilibrium Cr _ 2 O _ 7 ^ 2- ⇋ 2 CrO _ 4 ^ 2- is shifted to the right in: (Jee Main 2024)
• Arrange the following compounds in order of decreasing acidity: array l (I) (II) (III) ; (IV) array
• Solubility product of BaCl 2 is 4 × 10 –9 . Its solubility in moles/litre would be
• Given below are two statements: Statement I: Aqueous solution of ammonium carbonate is basic. Statement II…
• 2H 2 O ⇌ H 3 O + + OH – , K w = 1 × 10 –14 at 25ºC hence K a is:
• The best indicator for detection of end point in titration of a weak acid and a strong base is :
• When NH 4 Cl is added to a solution of NH 4 OH :
• In the following reversible reaction 2SO 2(g) + O 2(g) ⇌ 2SO 3(g) + Q Cal Most suitable condition for the higher…
• For a concentrated solution of a weak electrolyte ( K_ q = equilibrium constant) A_ 2 B_ 3 of concentration ‘c’, the…
• For a sparingly soluble salt AB 2 , the equilibrium concentrations of A 2+ ions and B − ions are 1.2 × 10 −4 M and 1.2…
• For the system 3A + 2B ⇌ C, the expression for equilibrium constant is
• For the reversible reaction, N 2 (g) + 3H 2 (g) ⇌ 2NH 3 (g) at 500°C, the value of K p is 1.44 × 10 –5 when partial…
• HCN is a weak acid (K a = 6.2 × 10 –10 ). NH 4 OH is a weak base (K b = 1.8 × 10 –5 ). A 1.0 M solution of NH 4 CN…
• Concentration CN – in 0.1 M HCN is [K a = 4 × 10 –10 ]
• For the equilibrium N 2(g) + 3H 2(g) ⇌ 2NH 3(g) , K c at 1000K is 2.37 × 10 –3 If at equilibrium [N 2 ] = 2M, [H 2 ] =…
• At a certain temp. 2HI ⇌ H 2 + I 2 Only 50% HI is dissociated at equilibrium. The equilibrium constant is
• The following equilibrium exists in aqueous solution, CH 3 COOH ⇌ CH 3 COO – + H + if dil HCl is added, without change…
• The yield of product in the reaction A 2 (g)+ 2B(g) ⇌ C(g) – Q kJ, would be high at
• I _ 2 + I ^ - I _ 3 ^ - This reaction is set-up in aqueous medium. We start with 1 mol of I 2 and 0.5 mol of I – in 1L…
• In which of the following dissociation of NH 4 OH will be minimum
• CaCO 3 and BaCO 3 have solubility product values 1 × 10 –8 and 5 × 10 –9 , respectively. If water is shaken up with…
• Pure water is kept in a vessel and it remains exposed to atmospheric CO 2 which is absorbed, then its pH will be
• The pH value of a saturated solution of M(OH) 2 is 10. The K sp value at this temperature is:
• Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H + ion concentration in…
• A precipitate of AgCl is formed when equal volumes of the following are mixed. [K sp for AgCl = 10 –10 ]
• 20 cm 3 of x M solution of HCl is exactly neutralised by 40 cm 3 of 0.05 M NaOH solution, the pH of HCl solution is
• For the system A(g) + 2B(g) ⇌ C(g),the equilibrium concentrations are A = 0.06 mol/litre, B = 0.12 mol/litre, C = 0.216…
• 4.5 moles each of hydrogen and iodine heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found…
• Equal volumes of two solutions of hydrochloric acid are mixed. One solution has a pH 1 while the other has a pH 5 . The…
• In the reaction 2H 2 O ⇌ H 3 O + + OH – , water is
• Equilibrium constants K _ 1 and K _ 2 for the following equilibria NO(g) + 1 2 O 2 ⇌ NO 2 (g) and 2NO 2 (g) ⇌ 2NO(g) +…
• At a certain temperature the value of pK w is 13.4 and the measured pH of soln is 7 . The solution is
• What is the effect of halving the pressure by doubling the volume on the following system at 500°C? H 2 (g) + I 2 (g)…
• Two buffer solutions, A and B, each made with acetic acid and sodium acetate differ in their pH by one unit, A has salt…
• On a given condition, the equilibrium concentration of HI, H 2 and I 2 are 0.80, 0.10 and 0.10 mole/litre. The…
• The equilibrium constant for this reaction is 3.6×10 –7 . OCl ^ - ( aq .)+ H _ 2 O ( l ) HOCl ( aq .)+ OH ^ - ( aq .)…
• Phenolphthalein does not act as an indicator for the titration between
• The effect of addition of helium gas to the following reaction in equilibrium state, is: PCl _ 5 ( ~g ) PCl _ 3 ( ~g )+…
• The pH value of 0.1 M solution of anilinium chloride is: ( K _ a of C _ 5 H _ 5 NH _ 3 ^ + =10^ -5 )
• K sp for Ca(OH) 2 is 5.5 × 10 –6 . What is the maximum pH that can be attained in a sewage tank treated with slaked…
• The solubility product of AgI at 25 ° C is 1.0 × 10 -16 mol 2 L -2 . The solubility of AgI in 10 -4 N solution of KI at…
• The equilibrium P 4 (s) + 6 Cl 2 (g) 4 PCl 3 (g) is attained by mixing equal moles of P 4 and Cl 2 in an evacuated…
• Given below are two statements one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The…
• Calculate the partial pressure of carbon monoxide from the following CaCO 3 (s) CaO(s) + CO 2 ↑; K p = 8 × 10 –2 CO 2…
• In the reaction A(g) + 2B(g) ⇌ C(g) + Q kJ, greater product will be obtained or the forward reaction is favoured by
• 0.6 mole of NH 3 in a reaction vessel of 2 dm ^ 3 capacity was brought to equilibrium. The vessel was then found to…
• Solubility of MX 2 -type electrolyte is 0.5 × 10 -4 mol/L. Then find out K sp of electrolyte:
• A sample of 50.0 mL of 0.10 M NH 3 (K b = 1.8 × 10 –5 ) is titrated with 0.10 M HCl. Calculate the pH at the…
• 5.1g NH 4 SH is introduced in 3.0 L evacuated flask at 327°C. 30% of the solid NH 4 SH decomposed to NH 3 and H 2 S as…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• The correct representation for solubility product of SnS 2 is
• 0.005 M acid solution has pH 5. The percentage ionisation of acid is:
• Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g) If total…
• Degree of dissociation of 0.1 N CH 3 COOH is (Dissociation constant = 1 × 10 –5 )
• The pH of the solution of which of the following salts will be independent or almost independent of the concentration…
• N 2(g) + O 2(g) ⇌ 2NO (g) - Q cal In the above reaction which is the essential condition for the higher production of…
• In equilibrium CH 3 COOH + H 2 O CH 3 COO – + H + The equilibrium constant may change when
• A certain buffer solution contains equal concentration of X ^ and HX. The K b for X ^ is 10 –10 . The pH of the buffer…
• Ka 1 , Ka 2 and Ka 3 are the respective ionization constants for the following reactions (a ), (b ), and (c ). (JEE…
• The number of H + ions present in 1 mL of a solution having pH = 13 is :
• What will be the pH of a solution formed by mixing 40 ml of 0.10 M HCl with 10 ml of 0.45 M NaOH
• 4 moles of A are mixed with 4 moles of B. At equilibrium for the reaction A + B ⇌ C + D, 2 moles of C and D are formed…
• Calculate K c for the reaction, A(g)+B(g) 2 C(g) , if 1.00 mole of A, 1.4 moles of B and 0.5 mole of C are placed in a…
• The Plot of pH-metric titration of weak base NH 4 OH vs strong acid HCl looks like: (JEE Main 2022)
• In the reaction, A 2 (g) + 4 B 2 (g) ⇌ 2AB 4 (g) H 4 is will be favoured at
• For the reaction A + 2B ⇌ C, the expression for equilibrium constant is
• The values of dissociation constants of some acids (at 25°C) are as follows. Indicate which is the strongest acid in…
• Solubility of Ca(OH) 2 is S mol L -1 . The solubility product (K sp ) under the same condition is:
• Which one of the following substance has the highest proton affinity
• The K sp for bismuth sulphide (Bi 2 S 3 ) is 1.08 × 10 –73 . The solubility of Bi 2 S 3 in mol L –1 at 298 K is (JEE…
• Class XII students were asked to prepare one litre of buffer solution of pH 8.26 by their chemistry teacher. The amount…
• Consider the following two gaseous equilibrium at a definite temperature, AB ( ~g )+ 1 2 ~B _ 2 ~K _ 1 AB _ 2 ( ~g ) 2…
• The formation of SO 3 takes place according to the following reaction, 2SO 2(g) + O 2(g) ⇌ 2SO 3(g) ; ∆H = – 45.2 kcal…
• The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detection. pH…
• According to Bronsted principle, an aqueous solution of HNO 3 will contain
• The pH of blood is maintained by the balance between H 2 CO 3 and NaHCO 3 . If the amount of CO 2 in the blood is…
• For N 2(g) + 3H 2(g) ⇌ 2NH 3(g) + heat
• Calculate G ^ for conversion of oxygen to ozone 3 2 O 2 (g) ⇌ O 3 (g) at 298 K, if K p for this conversion is 2.47 × 10…
• A is an aqueous acid; B is an aqueous base. They are diluted separately, then
• What is the pH value at which Mg(OH) 2 begins to precipitate from a solution containing 0.2 M Mg 2 + ions, where K sp…
• A monoprotic acid in 1.00 M solution is 0.01% ionised. The dissociation constant of this acid is
• 40% of a mixture of 0.2 mol of N 2 and 0.6 mol of H 2 reacts to give NH 3 according to the equation : N _ 2 +3 H _ 2 2…
• Which of the following statement(s) is/are correct? (A) The pH of 1 × 10 –8 M HCl solution is 8 . (B) The conjugate…
• The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal. Fe 2 O 3(s) + 3CO (g) ⇌ Fe…
• A certain weak acid has a dissociation constant of 1.0 x 10 -4 . The equilibrium constant for its reaction with a…
• For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of…
• The reaction A + B ⇌ C + D + Heat, has reached equilibrium. The reaction may be made to proceed forward by
• For a “c molar” concentrated solution of a weak electrolyte A x B y , the degree of dissociation is given as
• In which of the following, the reaction proceeds towards completion?
• 4.0 moles of argon and 5.0 moles of PCl 5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The…
• The reaction between N 2 and H 2 to form ammonia has K c = 6 × 10 –2 at the temperature 500°C. The numerical value of K…
• A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization…
• For which of the following reactions does the equilibrium constant depend on the units of concentration?
• At equivalence point, which of the following acid base reaction pH will be greater than 8 ?
• The solubility product of different sparingly soluble salts are : 1 . XY = 4 × 10 –20 2 . X 2 Y = 3.2 × 10 –11 3 . XY 3…
• For the reaction N 2 (g) + O 2 (g) ⇌ 2NO (g), the value of K c at 800 ° C is 0.1. When the equilibrium concentration of…
• 0.1 mole of CH 3 NH 2 (K b = 5 × 10 –4 ) is mixed with 0.08 mole of HCl and the solution diluted to one litre. The H +…
• The solution of strong acid and weak base (FeCl 3 ) is
• If the concentration of OH ^ - ions in the reaction Fe ( OH )_ 3 (5) Fe ^ 3+ ( aq. )+30 H ^ - (aq) is decreased by 1 4…
• The exothermic formation of ClF 3 is represented by the equation Cl 2 (g) + 3F 2 (g) ⇌ 2ClF 3 (g); ∆H = – 329 kJ Which…
• At 90 ° C, pure water has [H 3 O + ] as 10 -6 mol L -1 . What is the value of K w at 90°C?
• 2 mol of N 2 is mixed with 6 mol of H 2 in a closed vessel of one litre capacity. If 50% of N 2 is converted into NH 3…
• Solubility of calcium phosphate (molecular mass, M) in water is W g per 100 mL at 25℃. Its solubility product at 25℃…
• The vapour density of completely dissociated NH 4 Cl is
• In base vs. Acid titration, at the end point methyl orange is present as (JEE Main 2022)
• An acid solution of pH = 6 is diluted hundred times. The pH of the solution becomes:
• The suitable expression for the equilibrium constant of the reaction 2NO (g) + C l 2 (g) ⇌ 2NOC l (g) is
• Which of the following information can be obtained on the basis of Le-chatelier’s principle?
• Consider the reaction equilibrium, 2SO 2 (g) + O 2 (g) ⇌ 2SO 3 (g) ΔH o = -198K On the basis of Le-Chatelier's…
• For a sparingly soluble salt A p B q , the relationship of its solubility product (L S ) with its solubility (S) is :
• The pK a of a weak acid, HA is 4.80. The pK b of a weak base, BOH is 4.78. The pH of an aqueous solution of the…
• At a given temperature, the equilibrium constant for reaction PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g) is 2.4 × 10 –3 . At the…
• The pH of 0.1 M solution of the following salts increases in the order :
• Consider the titration listed below. In which is the pH at the equivalence point described incorrectly ? array lll Acid…
• One mole of N 2 O 4(g) at 100 K is kept in a closed container at 1.0 atm pressure. It is heated to 400 K, where 30% by…
• H 2 (g) + I 2 (g) ⇌ 2HI(g) ∆H = + q cal, then formation of HI
• 25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1.05 M) solution. The ion(s)…
• Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A…
• What is the pH of 0.01 M glycine solution ? For glycine K _ a _ 1 = 4.5 × 10 –3 and K _ a _ 2 = 1.7 × 10 –10 at 298 K
• Calculate the carbonate ion concentration in a 0.10 M solution of the weak acid, carbonic acid are (H 2 CO 3 ). The…
• In a reaction A + B ⇌ C + D, the concentrations of A, B, C and D (in moles/litre) are 0.5, 0.8, 0.4 and 1.0…
• Which one of the following statements is true with regard to a 0.10 M H 2 SO 4 solution ?
• G ^ ( HI ; g ) +1.7 ~kJ . What is the equilibrium constant at 25ºC for 2HI(g) ⇌ H 2 (g) + I 2 (g)?
• The solubility product of a salt having general formula MX 2 , in water is : 4 × 10 –12 . The concentration of M 2+…
• Which acid-base indicator should be used in an aqueous solution titration which is complete at about 0.001 M H + (aq)?…
• 100 mL of a buffer solution contains 0.1 M each of weak acid HA and salt NaA. How many gram of NaOH should be added to…
• The vapour pressure of water at 20°C is 17.5 torr. What will be the no. of moles of water present in one litre of air…
• In which of the following acid-base titration, pH is greater than 8 at the equivalence point ?
• 15 mol of H 2 and 5.2 moles of I 2 are mixed and allowed to attain equilibrium at 500ºC. At equilibrium, the…
• Three reactions involving H _ 2 PO _ 4 ^ - are given below: H 3 PO 4 + H 2 O → H 3 O + + H 2 PO - 4 H 2 PO 4 - + H 2 O…
• The equivalent conductance of M 32 solution of a weak monobasic acid is 8.0 mho cm 2 and at infinite dilution is 400…
• The solubility in water of a sparingly soluble salt AB 2 is 1.0 × 10 –5 mol l –1 . Its solubility product number will be
• For the reaction equilibrium N 2 O 4(g) ⇌ 2NO 2(g) , the concentrations of N 2 O 4 and NO 2 at equilibrium are 4.8 × 10…
• The equilibrium SO 2 Cl 2 (g) ⇌ SO 2 (g) + Cl 2 (g) is attained at 25 ° C in a closed container and an inert gas…
• The degree of dissociation of PCl 5 (g) obeying the equilibrium, PCl _ 5 PCl _ 3 + Cl _ 2 , is approximately related to…
• The equilibrium constant for the reaction N _ 2 ( ~g )+ O _ 2 ( ~g ) 2 NO ( ~g ) at temperature T is 4 × 10 -4 . The…
• Assuming dissociation of HCl to be 95%, the pH value of a solution containing 0.192 g of the acid per 500 mL, is:
• In a mixture of a weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The pH of…
• What is the pH of a buffer solution which is 0.250 M in benzoic acid, C 6 H 5 COOH, and 0.150 M in sodium benzoate, C 6…
• Consider the following gaseous equilibria with equilibrium constant K 1 and K 2 respectively. 50_ 2 (g)+ 1 2 0_ 2 (g) ⇌…
• Consider the following statements The pH of a mixture containing 400 mL of 0.1 M H 2 SO 4 and 400 mL of 0.1 M NaOH will…
• The following two equilibria exist simultaneously in a closed vessel : PCl 5 (g) ⇌ PCl 3 (g) + Cl 2 (g) COCl 2 (g) ⇌ CO…
• K a for HF is 3.5 × 10 –4 . Calculate K b for the fluoride ion.
• At 298 K, the solubility product of PbCl 2 is 1.0 × 10 –6 . What will be the solubility of PbCl 2 in moles/litre
• Solubility product of a salt AB is 1 × 10 -8 in a solution in which concentration of A + is 10 -3 M. The salt will…
• For the reaction H 2 (g) + I 2 (g) ⇌ 2HI(g) at 721K the value of equilibrium constant (K c ) is 50. When the…
• The reaction quotient (Q) for the reaction N 2 (g) + 3H 2 (g) ⇌ 2NH 3 (g) is given by: Q= [ NH _ 3 ]^ 2 [ ~N _ 2 ] [ H…
• For the reaction 2SO 2 + O 2 ⇌ 2SO 3 , the units of K c are
• The dissociation constant of HCN is 5 × 10 –10 . The pH of the solution prepared by mixing 1.5 mole of HCN and 0.15…
• Review the equilibrium and choose the correct statement HClO 4 + H 2 O ⇌ H 3 O + + ClO 4 –
• For a weak acid HA, Ostwald’s dilution law is represented by the equation
• In Haber process, 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of…
• At 90ºC, pure water has [H 3 O + ] = 10 –6 mole litre –1 . What is the value of K w at 90º C ?
• In the reaction, H 2 + I 2 ⇌ 2HI. In a 2 litre flask, 0.4 moles of each H 2 and I 2 are taken. At equilibrium 0.5 moles…
• Given below are two statements: Statement I: Methyl orange is a weak acid. Statement II: The benzenoid form of methyl…
• A 1 M solution of glucose reaches dissociation equilibrium according to equation given below 6HCHO ⇌ C 6 H 12 O 6 …
• pH of a solution produced when an aqueous solution of pH 6 is mixed with an equal volume of an aqueous solution of pH 3…
• Change in volume of the system does not alter the number of moles in which of the following equilibrium
• According to law of mass action, rate of a chemical reaction is proportional to
• At −20℃ and 1 atm pressure, a cylinder is filled with equal number of H 2 , I 2 and HI molecules for the reaction H 2…
• In the following reaction, AgCl + KI ⇌ KCl + AgI as KI is added, the equilibrium is shifted towards right giving more…
• Which indicator is suitable for the titrations :
• A mixture of 0.3 mole of H 2 and 0.3 mole of I 2 is allowed to react in a 10 litre evacuated flask at 500ºC. The…
• When the hydrogen ion concentration [H + ] changes by a factor of 1000, the value of pH of the solution _______. (Jee…
• For the equilibrium AB (g) ⇌ A(g) + B(g). K p is equal to four times the total pressure. Calculate the number moles of…
• The solubility of CH 3 COOAg in a buffer solution with pH = 4, whose K sp = 10 –12 and K a = 10^ -4 3 is
• HX is a weak acid (K a = 10 -5 ). It forms a salt NaX (0.1M) on reacting with caustic soda. The degree of hydrolysis of…
• When equal volumes of the following solutions are mixed, precipitation of AgCl (K sp = 1.8 × 10 –10 ) will occur only…
• The precipitate of CaF 2 (K sp = 1.7 × 10 -10 ) is obtained, when equal volumes of the following are mixed:
• The solubility of AgCl will be maximum in which of the following? (JEE Main 2022)
• Two solids dissociate as follows A(s) B(g)+C(g) ; K_ p_ 1 =x ~atm ^ 2 (5) [(g)+E(g) ; K_ p_ 2 =y a t m^ 2 . The total…
• The solubility product of A 2 X 3 is 1.08 × 10 -23 . Its solubility will be:
• The pH of a 0.1 M aqueous solution of a weak acid (HA) is 3. What is its degree of dissociation ?
• Consider the reaction, N _ 2 ( ~g )+3 H _ 2 ( ~g ) 2 NH _ 3 ( ~g ) The equilibrium constant of the above reaction is…
• The degree of dissociation of 0.1 M HCN solution is 0.01%. Its ionisation constant would be
• Solution of 0.1 N NH 4 OH and 0.1 N NH 4 Cl has pH 9.25, then find out the pK b of NH 4 OH.
• XY 2 dissociates as : X Y_ 2 X Y+Y Initial pressure of XY 2 is 600 mm Hg. The total pressure at equilibrium is 800 mm…
• The equilibrium concentration of X, Y and YX 2 are 4, 2 and 2 M respectively for the equilibrium 2X + Y ⇌ YX 2 . The…
• 3.2 moles of hydrogen iodide were heated in a sealed bulb at 444°C till the equilibrium state was reached. Its degree…
• K sp of Mg(OH) 2 is 4.0 × 10 –6 . At what minimum pH, Mg 2+ ions starts precipitating 0.01 MgCl 2
• Incorrect statement for the use of indicators in acid-base titration is : (Jee Main 2023)
• At the equilibrium of the reaction N _ 2 O _ 4 ( ~g ) 2 NO _ 2 ( ~g ) , the observed molar mass of N 2 O 4 is 77.70 gm…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: If HCl gas…
• If pH of a saturated solution of Ba(OH) 2 is 12, the value of its K sp is:
• Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the…
• In which of the following equilibria, the value of K p is less than K c ?
• For the given reaction, choose the correct expression of K C from the following:- Fe _ ( m ) ^ 3+ + SCN _ ( m ) ^ - ⇋ (…
• The addition of K 2 CO 3 (aq) to the following solution is expected to produce a precipitate in every case but that one…
• 20 mL of 0.1 M NH 4 OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (Given: K b (NH 4 OH) =…
• Which one of the following salts gives an acidic solution in water
• The equilibrium constant (K p ) for the reaction. PC l 5 (g) PC l 3 (g) + C l 2 (g) is 16 . If the volume of the…
• The solubility of CaF 2 is s moles/litre. Then solubility product is:
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
• Under what vapour pressure of moisture in atmospheric condition CuSO 4 .5H 2 O will be efflorescent? Cu 5 O _ 4 .5 H _…
• For a reaction at equilibrium A(g) B(g)+ 1 2 C(g) the relation between dissociation constant (K), degree of…
• An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of
• The ratio K_ p K_ c for the reaction: CO _ (k) + 1 2 O _ 2(k) ⇌ CO _ 2( ) is: (Jee Main 2024)
• An equilibrium mixture of the reaction 2H 2 S(g) ⇌ 2H 2 (g) + S 2 (g) had 0.5 mole H 2 S, 0.10 mole H 2 and 0.4 mole S…
• Which is the correct representation of the solubility product constant of Ag 2 CrO 4
• The equilibrium constant for the reaction: SO 3 (g) ⇋ SO 2 (g) + 1 2 O 2 (g) is K c = 4.9 × 10 -2 . The value of for…
• In chemical reaction A ⇌ B, the system will be known in equilibrium when
• If α is the degree of ionization, C the concentration of a weak electrolyte and K a the acid ionization constant, then…
• The effect of increasing the pressure on the equilibrium 2A(g) + 3B(g) ⇌ 3A(g) + 2B(g) is
• In a chemical reaction, A +2 ~B K C + D , the initial concentration of B was 1.5 times of the concentration of A, but…
• According to Cahn-Ingold-Prelog sequence rules, the correct order of priority for the given group is:
• Fixed volume of 0.1 M benzoic acid (pK a = 4.2) solution is added into 0.2 M sodium benzoate solution and formed a 300…
• Which is the correct alternate for hydrolysis constant of NH 4 CN
• The equilibrium constant for the reaction N 2 (g) + O 2 (g) ⇌ 2NO (g) at temperature T is 4 × 10 –4 . The value of K c…
• In which of the following system, doubling the volume of the container cause a shift to the right?
• Solid Ba(NO 3 ) 2 is gradually dissolved in a 1.0 × 10 -4 M Na 2 CO 3 solution. At what concentration of Ba 2 + will a…
• To 1.0 L solution containing 0.1 mol each of NH 3 and NH 4 Cl, 0.05 mol NaOH is added. The change in pH will be (pK b…
• Why are strong acids generally used as standard solutions in acid-base titrations ?
• Given below are two statements: Statement I: On passing HCl (g) through a saturated solution of BaCl 2 , at room…
• Two moles of NH 3 when put into a previously evacuated vessel (one litre), partially dissociate into N 2 and H 2. If at…
• 200 mL of 0.01 M HCl is mixed with 400 mL of 0.01M H 2 SO 4 . The pH of the mixture is ____. (JEE Main 2022)
• The dissociation constants of monobasic acids A, B, C and D are 6 × 10 –4 , 5 × 10 –5 , 3.6 × 10 –6 and 7 × 10 –10…
• Equilibrium constant (K p ) for the reaction N _ 2 O _ 4 ( ~g ) 2 NO _ 2 ( ~g ) is 0.25 atm, if the partial pressure of…
• Unit of equilibrium constant for the reversible reaction H 2 + I 2 ⇌ 2HI is
• 15 moles of H 2 and 5.2 moles of I 2 are mixed and allowed to attain equilibrium at 500 ° C. At equilibrium, the…
• The solubility of CaF 2 is a moles/litre. Then its solubility product is........
• In which of the following equilibrium system is the rate of the backward reaction is favoured by an increase of…
• Let the solubility of an aqueous solution of Mg(OH) 2 be x then its K sp is
• Aspirin (acetyl salicyclic acid, molar mass = 180 g mol –1 ) used as analgesic has pK a value of 2 . Two tablets of…
• The pH of a solution is increased from 3 to 6; its H + ion concentration will be :
• The equilibrium SO 2 Cl 2 (g) ⇌ SO 2 (g) + Cl 2 (g) is attained at 25°C in a closed container and an inert gas helium…
• The pK b of CN ^ is 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water and making the…
• A patient is said to suffer from acidosis when the pH of his blood
• The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH…
• The hydrogen ion concentration in weak acid of dissociation constant K a and concentration c is nearly equal to
• Following gaseous reaction is undergoing in a vessel C 2 H 4 + H 2 ⇌ C 2 H 6 ; ∆H = – 32.7 Kcal Which will increase the…
• An acid solution of pH = 6 is diluted hundred times. The pH of the solution becomes :
• 0.30 mole of N 2 O 4 is allowed to equilibrate in a 4 litre vessel. If x mole of N 2 O 4 dissociates and 0.4 mole of NO…
• For the reaction, H 2 (g) + I 2 (g) ⇌ 2HI (g) the equilibrium constant K p changes with:
• K c for A + B ⇌ 3C is 20 at 25°C. If a 2 litre vessel contains 1, 2 and 4 moles of A, B and C respectively. the…
• Given below are two statements: Statement: A Buffer solution is the mixture of a salt and an acid or a base mixed in…
• The exothermic formation of ClF 3 is represented by the equation: Cl 2 (g) + 3F 2 (g) ± 2ClF 3 (g); ΔH r = -329 kJ…
• In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the…
• Consider the following equilibrium in a closed container : N 2 O 4 (g) ⇌ 2 NO 2 (g). At a fixed temperature, the volume…
• At 25 ° C, the dissociation constant of a base, BOH is 1.0 × 10 -12 . The concentration of hydroxyl ions in 0.01 M…
• In a saturated solution of H 2 S,decreasing the pH of the solution will cause
• Calculate the pH of a buffer prepared by mixing 0.10 mol of sodium formate and 0.05 mole of formic acid in 1.0 L of…
• The pK a of weak acid (HA) is 4.5 . The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is
• The degree of hydrolysis in hydrolytic equilibrium A ^ - + H _ 2 O HA + OH ^ - at salt concentration of 0.001 M is (K a…
• The formation of nitric oxide by contact process N 2(g) + O 2(g) ⇌ 2NO (g) , ∆H (g) = 43.200 kcal is favoured by
• A mixture of 100 mmol of Ca(OH) 2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100…
• For a fairly concentrated solution of a weak electrolyte A x B y , the degree of dissociation is given by:
• For the reaction: CO(g) + H 2 O(g) ⇌ CO 2 (g) + H 2 (g), at a given temperature, the equilibrium amount of CO 2 (g) can…
• In the hydrolysis of a salt of weak acid and weak base, the hydrolysis constant K h is equal to:
• K a for hydrofluoric acid is 6.9 × 10 –4 . What is the equilibrium constant K for the following reaction ? F ^ - ( aq…
• The rate constant for forward and backward reactions of hydrolysis of ester are 1.1 × 10 –2 and 1.5 × 10 –3 per minute…
• A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of [ CH _ 3 CH…
• In a 500 ml capacity vessel, CO and C l 2 are mixed to form COCl 2 . At equilibrium, it contains 0.2 moles of CoCl 2…
• The rate of forward reaction is two times that of reverse reaction at a given temperature and identical concentration…
• Pure ammonia is placed in a vessel at temperature where its dissociation ( ) is appreciable. At equilibrium
• In which of the following reaction, the value of K _ p will be equal to K _ c ?
• At 273 K and one atm, a litre of N 2 O 4 decomposes to NO 2 according to the equation: N _ 2 O _ 4 ( ~g ) 2 NO _ 2 ( ~g…
• A + B ⇌ C + D. If initially the concentration of A and B are both equal but at equilibrium, concentration of D will be…
• The pH of a dilute solution of acetic acid was found to be 4.3 . The addition of a small crystal of sodium acetate will…
• Which of the following statements regarding a chemical equilibrium is wrong?
• The equilibrium constant for the reaction; 5 O_ 3 (g) 5 O_ 2 (g)+ 1 2 O_ 2 (g) is K c = 4.9 × 10 -2 . The value of K c…
• 0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant is

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